MOSS: SPListItem.Update() throws error Operation is not valid due to the current state of the object...

本文探讨了在 SharePoint 开发中使用 SPSecurity.RunWithElevatedPrivileges 执行 SPListItem.Update() 时遇到的 “Operation is not valid due to the current state of the object” 错误。提供了两种解决方法:一是将更新操作移出特权运行块;二是通过 SPContext 获取站点和 Web 对象。

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问题:

在SPSecurity.RunWithElevatedPrivileges 代码块中执行SPListItem.Update(),

SPSecurity.RunWithElevatedPrivileges

                (

                    () =>

                    {

                        using (SPSite site = new SPSite("web url"))

                        {

                            using (var tempWeb = site.OpenWeb())

                            {

                                var list = tempWeb.Lists["mylist"];

                                var Item = list.Items[0];

                                Item["Title"] = "new Title";

                                Item.Update();

                            }

                        }

                    }

                ); 

将会得到如下错误:Operation is not valid due to the current state of the object.

 

 解决此问题有两个办法:

1。Item.Update();放到SPSecurity.RunWithElevatedPrivileges语句块的外面。

 

SPListItem Item = null;                

      SPSecurity.RunWithElevatedPrivileges

                (

                    () =>

                    {

                        using (SPSite site = new SPSite("web url"))

                        {

                            using (var tempWeb = site.OpenWeb())

                            {

                                var list = tempWeb.Lists["mylist"];

                                Item = list.Items[0];                               

                            }

                        }

                    }

                );

      Item["Title"] = "new Title";

      Item.Update();

 详情可参考老外的原文:http://littletalk.wordpress.com/2009/04/03/moss-splistitemupdate-throws-error-operation-is-not-valid-due-to-the-current-state-of-the-object/

 

2. 第二个方法是在new SPSite(),SPWeb时不能Hard Code URL类似于以上的代码,

应该使用如下方式:

        var webContext = SPContext.Current.Web; 

        SPSecurity.RunWithElevatedPrivileges

                (

                    () =>

                    {

                        using (SPSite site = new SPSite(webContext.Site.ID))

                        {

                            using (var tempWeb = site.OpenWeb(webContext.ID))

                            {

                                var list = tempWeb.Lists["mylist"];

                                var Item = list.Items[0];

 

                                Item["Title"] = "new Title";

                                Item.Update();

                            }

                        }

                    }

                );

但是此方法有一个问题:在非Web应用程序的中,如控制台程序,以上代码将出现错误,因为SPContext.Current.Web为Null。

 详情可参考老外的原文:http://vspug.com/ssa/2007/11/25/operation-is-not-valid-due-to-the-current-state-of-the-object/

 

转载于:https://www.cnblogs.com/ITHelper/archive/2009/12/29/1634957.html

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